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became the common, even household, name.
Today, we have a good understanding
of how certain black holes like Sig X-1 come to be.
Stars burn hydrogen and helium fuel
until that fuel is exhausted,
at which point the heat generated from fusion
is no longer great enough to sustain them
against the gravity that wants to pull their matter in
on itself.
If the mass of the dying star
is more than about three times that of our sun,
then theoretically, there is no *****
that can stop it collapsing completely in.
Much of the outer shell of material
may be exploded outwards in a dramatic supernova,
leaving behind an extremely dense remnant
that curves space-time,
just as Karsh Fardschild predicted.
This remnant is surrounded by an event horizon,
a point of no return which marks its new boundary.
The edge of the so-called hole,
which lives on to swallow any luckless matter
that passes its way.
The more matter it swallows,
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